A report by the United Nations Conference on Trade and Development (UNCTAD) shows Saudi Arabia has the largest number of mobile phone users worldwide. The report revealed that there are 180 mobile phones for every 100 residents in Saudi, and that the usage of mobile phones is on the rise among teenagers and children as young as nine years in age. Saudi Arabia came first in the report despite its population of 25 million of which a sizable number is expatriates. China’s Macau Island came second after Saudi Arabia. Macau is considered to be the most densely populated region in the world, with a population density of 18,428 persons per square kilometer. There is no population data for the number of people living on the island.